import java.util.Scanner;
// 拓展
public class Test3 {
    private static int flag = 0;
    public static void main(String[] args) {
        Thread t1 = new Thread(() -> {
            while (flag == 0){
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
            System.out.println("t1 线程结束");
        });

        Thread t2 = new Thread(() -> {
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入 flag 的值：（非0表示结束）");
            flag = scanner.nextInt();
            System.out.println("t2 线程结束");
        });

        t1.start();
        t2.start();
    }

}
